net mvc,jQuery/JavaScript-将变量(对象)传递给操作方法
我在asp.net局部视图中执行jQuery$.ajax函数,以调用控制器操作方法来设置会话变量 我将创建的var对象字符串化 如果我使用:net mvc,jQuery/JavaScript-将变量(对象)传递给操作方法,javascript,jquery,asp.net-mvc,Javascript,Jquery,Asp.net Mvc,我在asp.net局部视图中执行jQuery$.ajax函数,以调用控制器操作方法来设置会话变量 我将创建的var对象字符串化 如果我使用: contentType: "application/json", 它不进入控制器操作方法,而是 success: function 返回警报 我的控制台日志显示对象属性具有值 为什么不进入控制器操作方法? 在此场景中,如果我使用: contentType: "application/x-www-form-urlen
contentType: "application/json",
它不进入控制器操作方法,而是
success: function
返回警报
我的控制台日志显示对象属性具有值
为什么不进入控制器操作方法?
在此场景中,如果我使用:
contentType: "application/x-www-form-urlencoded; charset=UTF-8",
它确实进入控制器操作方法,但它接收的参数为NULL
然而,我的控制台日志显示对象属性具有值。和
success: function
返回警报
为什么输入参数为空?
部分观点:
@model GbngWebClient.Models.LikeOrDislikeVM
<style>
.fa {
cursor: pointer;
user-select: none;
}
.fa:hover {
color: blue;
}
/* I added. */
.my-size {
font-size: 20px;
}
.my-button {
border: none;
padding: 8px 10px;
/* To make the buttons stay on the same line. */
float: left;
font-size: 16px;
margin: 4px 2px;
background-color: white;
}
</style>
<div class="row">
<div>
<button class="blogLike my-button fa fa-thumbs-up"><span class="my-size, likeCount"> : @Model.LikeCount </span></button>
<button class="blogDisLike my-button fa fa-thumbs-down"><span class="my-size, dislikeCount"> : @Model.DisLikeCount</span></button>
</div>
</div>
@Scripts.Render("~/bundles/jquery")
@Scripts.Render("~/bundles/bootstrap")
@Styles.Render("~/Content/css")
<script type="text/javascript">
$(document).ready(function () {
// For testing:
console.log('Here at ready. ');
// JavaScript needs it as 'false'. So using these 'const' to convert them.
const False = false, True = true;
// Set the disabled attributes and color.
SetLike(@Model.LikeDisabled);
SetDisLike(@Model.DisLikeDisabled);
// Create the variable in the image of the LikeOrDislikeVM view model.
var holdLikeOrDislikeVM = {
BlogId : @Model.BlogId,
UserId: @Model.UserId,
LikeCount: @Model.LikeCount,
DisLikeCount: @Model.DisLikeCount,
LikeDisabled: @Model.LikeDisabled,
DisLikeDisabled: @Model.DisLikeDisabled,
};
console.log("hold: " + holdLikeOrDislikeVM.BlogId);
console.log("hold: " + holdLikeOrDislikeVM.UserId);
console.log("hold: " + holdLikeOrDislikeVM.LikeCount);
console.log("hold: " + holdLikeOrDislikeVM.DisLikeCount);
console.log("hold: " + holdLikeOrDislikeVM.LikeDisabled);
console.log("hold: " + holdLikeOrDislikeVM.DisLikeDisabled);
$.ajax({
type: 'POST',
url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
data: { likeOrDislikeVM: JSON.stringify(holdLikeOrDislikeVM) },
//contentType: "application/x-www-form-urlencoded; charset=UTF-8",
contentType: "application/json",
success: function (response) {
alert("Success. Response: " + response);
},
error: function (xhr, ajaxOptions, thrownError) {
alert("Critical Error: something is wrong in the call to SetModelSessionVar! Status: " + xhr.status + ". Error: " + thrownError.toString() + ". Response Text: " + xhr.responseText);
}
})
//--------------------------------------------------------------------------------------
// Set the disabled attribute to true or false.
//--------------------------------------------------------------------------------------
function SetLike(disabledSwitch) {
// For testing:
console.log('Here at Setlike. ' + disabledSwitch);
$(".blogLike").attr('disabled', disabledSwitch);
if (disabledSwitch == true )
{
// Show by color that it was previously liked.
$(".blogLike").css('color', 'green');
}
if (disabledSwitch == false)
{
// Show by color that it can be clicked.
$(".blogLike").css('color', 'black');
}
}
//--------------------------------------------------------------------------------------
// Set the disabled attribute to true or false.
//--------------------------------------------------------------------------------------
function SetDisLike(disabledSwitch) {
// For testing:
console.log('Here at SetDisLike. ' + disabledSwitch);
$(".blogDisLike").attr('disabled', disabledSwitch);
if (disabledSwitch == true)
{
// Show by color that it was previously disliked.
$(".blogDisLike").css('color', 'green');
}
if (disabledSwitch == false)
{
// Show by color that it can be clicked.
$(".blogDisLike").css('color', 'black');
}
}
});
</script>
控制器操作方法:
[HttpPost]
public void SetModelSessionVar(LikeOrDislikeVM likeOrDislikeVM)
{
// Sets a model session variable according to the argument passed in.
Session["likeOrDislikeVM"] = likeOrDislikeVM;
}
根据与freedomn-m的讨论,我发现: 对于控制器动作方法:
[HttpPost]
public void SetModelSessionVar(string likeOrDislikeVM)
{
Session["likeOrDislikeVM"] = likeOrDislikeVM;
}
[HttpPost]
public void SetModelSessionVar(LikeOrDislikeVM likeOrDislikeVM)
{
Session["likeOrDislikeVM"] = likeOrDislikeVM;
}
这是唯一有效的1(进入控制器方法时为:{“BlogId”:40,“UserId”:3,“LikeCount”:0,“DisLikeCount”:1,“LikeDisabled”:false,“DisLikeDisabled”:true}):
不工作(进入控制器方法时为:null):
不工作(进入控制器方法时为:null):
不工作(不进入控制器方法,控制台中未显示任何内容):
现在,控制器动作方法如下:
[HttpPost]
public void SetModelSessionVar(string likeOrDislikeVM)
{
Session["likeOrDislikeVM"] = likeOrDislikeVM;
}
[HttpPost]
public void SetModelSessionVar(LikeOrDislikeVM likeOrDislikeVM)
{
Session["likeOrDislikeVM"] = likeOrDislikeVM;
}
这是唯一有效的1(进入控制器方法时为:{模型的图像-这是我想要的,而不是上面的字符串):
注意:我必须从这个局部视图中定义的视图模型创建一个JavaScript对象,因为我似乎无法将该视图模型传递给控制器方法。不知道为什么。我不明白为什么我不能使用视图模型
使用此局部视图中定义的视图模型传递给控制器方法:
不工作(进入控制器方法时为:null):
使用此局部视图中定义的视图模型传递给控制器方法:
不工作(未进入控制器,控制台显示:未定义GbngWebClient引用错误:未定义GbngWebClient):
如果您
JSON.stringify
,那么您的操作参数将需要是public void SetModelSessionVar(string likeOrDislikeVM)
-事实并非如此,因此它与参数不匹配,因此您会得到null
确定。我更改了操作方法签名。如果我更改为:contentType:“application/x-www-form-urlencoded;charset=UTF-8”的形式为:{“BlogId”:40,“UserId”:3,“LikeCount”:0,“DisLikeCount”:1,“LikeDisabled”:false,“DisLikeDisabled”:true}。但如果使用contentType:“application/json”,则无法到达控制器。根据本文,参数可以定义为类模型,contentType可以是:“请参阅:该答案与您的答案之间的区别在于,它们在“根”处传递每个参数,而您有一个额外的参数名:data:{likeOrDislikeVM:json.stringify(holdLikeOrDislikeVM)},
应该是data:json.stringify(holdLikeOrDislikeVM),
然后模型绑定器将js名称与您的模型名称相匹配。这篇文章也令人困惑,因为它说您“需要使用json.stringify”-您不需要,但如果您不需要,那么就不要使用应用程序/json
-这两者结合在一起。这也是对web api的回答,而不是有效的mvc稍有不同。freedomn-m,我尝试了您的建议,并在上面添加了我的发现。请参阅:通过与freedomn-m的讨论,我发现:
$.ajax({
type: 'POST',
url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
data: JSON.stringify(holdLikeOrDislikeVM),
contentType: "application/x-www-form-urlencoded; charset=UTF-8",
error: function (xhr, ajaxOptions, thrownError) {
alert("Critical Error: something");
}
})
$.ajax({
type: 'POST',
url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
data: { likeOrDislikeVM: JSON.stringify(holdLikeOrDislikeVM)},
contentType: "application/json",
error: function (xhr, ajaxOptions, thrownError) {
alert("Critical Error: something");
}
})
[HttpPost]
public void SetModelSessionVar(LikeOrDislikeVM likeOrDislikeVM)
{
Session["likeOrDislikeVM"] = likeOrDislikeVM;
}
$.ajax({
type: 'POST',
url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
data: { likeOrDislikeVM: holdLikeOrDislikeVM },
contentType: "application/x-www-form-urlencoded; charset=UTF-8",
error: function (xhr, ajaxOptions, thrownError) {
alert("Critical Error: something");
}
})
$.ajax({
type: 'POST',
url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
data: { likeOrDislikeVM: '@Model' },
contentType: "application/x-www-form-urlencoded; charset=UTF-8",
error: function (xhr, ajaxOptions, thrownError) {
alert("Critical Error: something");
}
})
$.ajax({
type: 'POST',
url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
data: { likeOrDislikeVM: @Model},
contentType: "application/x-www-form-urlencoded; charset=UTF-8",
error: function (xhr, ajaxOptions, thrownError) {
alert("Critical Error: something");
}
})